I thin that summarises OVO - https://utilityweek.co.uk/ovo-tops-ukrn-list-for-complaints/
Ovo Energy received more complaints per 100,000 customers than any other supplier in the energy sector’s latest scorecard by the UK Regulators Networks (UKRN).
Beginning last year, UKRN publishes annual scorecards for four sectors: Energy, water, telecoms and finance.
The scorecards examine key consumer metrics covering service quality, price differentials and satisfaction levels.
Information in the scorecard for energy was collected by Ofgem in Q3 and Q4 2020 and compared to the same time in 2019, the total volume of complaints received by suppliers decreased.
Topping the list with 2,293 complaints per 100,000 in Q3 is Ovo Energy, which also includes the customers of SSE which it acquired in January last year, as well as those of Boost and Spark Energy.